Erm, don't you have to TOUCH Braille in order to read it? I don't think anyone's invented a system yet whereby the computer screen is flexible and pops out to make Braille. Otherwise I would have thought it would be pretty useless if you can't touch Braille, because the sight of it does not make sense. I'm not sure too many blind or "hard of seeing" people use IRC due to the fact it's 99% text based, although I do know of one person - they use a speech syntheziser that tends to keep up with the channel except when there's a bot flood.
Anyway, I don't know if Braille could be put in a script (via mIRC scripting anyway).
Regards,
